Reservoir Comprehensive Evaluation On Chang 6 And Chang 8 Reservior In Baihe

The characteristics of structure,deposition microfacies and sand body morphology,diagenesis,physical property and micro-pore structure,reservoir sensitivity and seepage flow of Chang 6 and Chang 8 in reservoir of Baihe are researched at the base of test results of cast thin section,SEM,cathode luminescence,grading analysis,high pressure mercury and sensitivity.Then the reservoir is evaluated,the main results as follow.Several latitudinal nose uplifts can be recognized in Chang6 and Chang8 reservoir,structure of every sublayer presents good succession.Chang6 and Chang8 reservoir is a set of delta front facies,and underwater distributary channel microfacies is the main save facies belt.Correspond relationship between sand body morphology and deposition microfacies is preferable,sand body of Chang6₁and Chang8₁develop more better than other sublayer in Chang6?Chang8 member.Studies have shown that rock types of Chang 6 and Chang 8 reservoir are mainly lightgray,gray,dark gray feldspar fine-grained sandstone,low composition maturity,roundness of secondary ribs-circle,good sorting,middle textural maturity.Experieneed compaetion,cementation,replacement and dissolution,and the types of porosity are mainly tergranular pore and dissoluted pore as the main oil storage space,he reservoirs and stone has reached the middle diagenesis A-B period.Microfaeies.sensitivity extent of each layer are weak,and reservoir Evaluation of the wettability performance of the partial hydrophilic appropriate waterflood development;sand body distribution and diagenes is the main factor to controlling gas accumulation,and the most favorable reservoir sand is the main channel.The key factors influencing reservior quality are selected,macroscopy is combined with microscope,weight is considered.Reservoir is evaluated synthetically,I types are always in the most favorable deposition microfacies and diagenetic facies.